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Tape dataset contention in JCL/DFSORT

 
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kumar26fl
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Joined: 08 Apr 2010
Posts: 14
Topics: 9
PostPosted: Wed Nov 17, 2010 12:25 pm    Post subject: Tape dataset contention in JCL/DFSORT Reply with quote
I am using this JCL to copy data from a tape dataset to a DASD dataset. The jcl works fine. However, if there is another job that is running and using the input tape dataset name, my job waits till the other job completes it stating 'contention with the other job' for the tape datasets.

Is there anyway, that my job can also be processed concurrently using the same input tape dataset while some other job is also running it. I know for sure that no other jobs are updating or writing it. The other jobs are also just reading it. Doesn't disp=shr allows multiple jobs to share and read the tape datasets?

Code:

//SORT1    EXEC PGM=ICEMAN                                       
//SYSOUT   DD  SYSOUT=*                                         
//SORTIN   DD  DSN=<<input tape datasetname>>
//             DISP=(SHR,KEEP,KEEP),DATACLAS=TAPEONLY,UNIT=AUTO,
//             VOL=(,,,255),DCB=BUFNO=30                         
//SORTOUT  DD  DSN=<<output dasd datasetname>>,                       
//             DISP=(NEW,CATLG,DELETE),                         
//             DATACLAS=LARGE,                                   
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=0)                 
//SYSIN DD *                                                     
 SORT FIELDS=COPY                                               
 OUTFIL FNAMES=SORTOUT,VTOF,BUILD=(5,80)                         
/*                                                               
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kolusu
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Joined: 26 Nov 2002
Posts: 12376
Topics: 75
Location: San Jose
PostPosted: Wed Nov 17, 2010 12:45 pm    Post subject: Reply with quote
kumar26fl,

You canNOT. Tapes are sequential and cannot be accessed simultaneously like disk datasets. However using VTAPE may solve some problems but not all.

Kolusu
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papadi
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Joined: 20 Oct 2009
Posts: 594
Topics: 1
PostPosted: Wed Nov 17, 2010 5:53 pm    Post subject: Reply with quote
This is nearly always dealt with by proper scheduling. . .

Suggest proper scheduling be set up for these processes.
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di
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